I first read about Thoughtforms many years ago. The concept is that you can create a “focused thought” with certain properties from your own thoughts and force of will.

It is said that conscious entities can also be created in this manner.

This concept has been around for thousands of years. Tulpas and Jinn also seem to be creations of thought in many cases.

This book goes into the histories of Jinns, Tulpas, and Thoughtforms which I think are all related and mostly incarnations of our conscious visualizations and force of will.

Many individual sightings and experiences are included.

This book also includes a Tulpa creation technique near the end which you should find very interesting.

Understanding all of these also leads to being able to create objects of power like powerful talismans, rings or other objects.